[wasm] Trim graph before scheduling.

src/compiler/mips/code-generator-mips.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 958 matching lines @@
       break;
     case kMipsSar:
       if (instr->InputAt(1)->IsRegister()) {
         __ srav(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1));
       } else {
         int32_t imm = i.InputOperand(1).immediate();
         __ sra(i.OutputRegister(), i.InputRegister(0), imm);
       }
       break;
     case kMipsShlPair: {
+      Register second_output =
+          instr->OutputCount() >= 2 ? i.OutputRegister(1) : i.TempRegister(0);
       if (instr->InputAt(2)->IsRegister()) {
-        __ ShlPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ ShlPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), i.InputRegister(2));
       } else {
         uint32_t imm = i.InputOperand(2).immediate();
-        __ ShlPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ ShlPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), imm);
       }
     } break;
     case kMipsShrPair: {
+      Register second_output =
+          instr->OutputCount() >= 2 ? i.OutputRegister(1) : i.TempRegister(0);
       if (instr->InputAt(2)->IsRegister()) {
-        __ ShrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ ShrPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), i.InputRegister(2));
       } else {
         uint32_t imm = i.InputOperand(2).immediate();
-        __ ShrPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ ShrPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), imm);
       }
     } break;
     case kMipsSarPair: {
+      Register second_output =
+          instr->OutputCount() >= 2 ? i.OutputRegister(1) : i.TempRegister(0);
       if (instr->InputAt(2)->IsRegister()) {
-        __ SarPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ SarPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), i.InputRegister(2));
       } else {
         uint32_t imm = i.InputOperand(2).immediate();
-        __ SarPair(i.OutputRegister(0), i.OutputRegister(1), i.InputRegister(0),
+        __ SarPair(i.OutputRegister(0), second_output, i.InputRegister(0),
                    i.InputRegister(1), imm);
       }
     } break;
     case kMipsExt:
       __ Ext(i.OutputRegister(), i.InputRegister(0), i.InputInt8(1),
              i.InputInt8(2));
       break;
     case kMipsIns:
       if (instr->InputAt(1)->IsImmediate() && i.InputInt8(1) == 0) {
         __ Ins(i.OutputRegister(), zero_reg, i.InputInt8(1), i.InputInt8(2));
@@ skipping 1234 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8